SMI Northeast (Smoke Management Instructions) Northeast Oregon Smoke Management Instructions

[ODF Smoke Management Instructions]

SMOKE MANAGEMENT FORECAST AND INSTRUCTIONS

SALEM FORESTRY WEATHER CENTER

OREGON DEPARTMENT OF FORESTRY



ISSUED: Wednesday, May 5, 2010       2:35 PM      Pete Parsons



1.  DISCUSSION AND FORECAST FOR NORTHEAST FORECAST AREA ZONES 630-638


    THURSDAY
The cold upper-level trough that has brought numerous rain and snow showers to the region will shift eastward.  Showers should taper off in the morning with skies becoming partly cloudy in the afternoon.  A very weak ridge, in a cool and drier northwesterly flow aloft, should limit afternoon convection.  Daytime heating will allow for good afternoon mixing with much lighter winds.   Temperatures will warm but remain below normal.

    OUTLOOK (FRIDAY-SUNDAY)

Westerly flow aloft, on Friday, will turn progressively more southwesterly Saturday and Sunday.  An upper-level trough is forecast to move over the region by late Sunday.  Skies will be partly to mostly cloudy with temperatures recovering close to normal.  The chance of showers, mainly over the mountains, will increase each afternoon.  Nighttime inversions may hold residual smoke close to the ground, through the early morning hours, but daytime heating will provide good afternoon smoke dispersal conditions.



2.  DISPERSION



THURSDAY



Zone 630 and 632:

Mixing height below 1500 ft early rising above 5000 ft by late morning.  Mixing height lowers to 1000 - 2000 ft during the evening.



Transport wind NW to N at 4 - 8 mph.



Surface wind NW to N at 4 - 8 mph during the morning and afternoon.  Surface wind becomes light and variable and controlled by local terrain during the evening.



Zone 633 - 638:

Mixing height 2100 - 3100 ft during the morning.  Mixing height rises to above 5000 ft during the afternoon then lowers to 1000 - 2000 ft during the evening.



Transport wind NW to N at 4 - 8 mph throughout the day.



Surface wind NW to N at 4 - 8 mph during the morning and afternoon.  Surface wind becomes light and variable and controlled by local terrain during the evening.



OUTLOOK:



FRIDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind SE to S at 5 - 9 mph during the morning becoming ENE to ESE at 4 - 8 mph during the afternoon.  Surface wind light and variable.



SATURDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind SE to S at 6 - 10 mph during the morning becoming light and variable during the afternoon.  Surface wind light and variable.



SUNDAY

Mixing height below 1000 ft early rising above 5000 ft by late morning and through the afternoon.  Transport wind NNW to NNE at 6 - 10 mph.  Surface wind NNW to NNE at 4 - 8 mph.



3.  BURNING INSTRUCTIONS FOR NORTHEAST OREGON ZONES 630-638

    The following considerations should be adhered to in addition to

    the requirements of the Oregon Smoke Management Plan. These

    Instructions are valid for burning conducted on Thursday, May 6, 2010.

    ==================================================================



Zone 630 and 632:

Avoid ignitions within 12 miles to the NW through ENE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 20 miles in all directions of SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.



Zone 633 - 638:

Avoid ignitions within 15 miles to the WNW through ENE of SSRAs.  For units that will smolder significantly through the night avoid burning within at least 30 miles in all directions of SSRAs.  Verify transport winds away from SSRAs if burning in any other direction.  Recommend against burning units that will smolder significantly overnight.



    =========================================================

4.  SPECIAL NOTE:



    The smoke management forecaster is available at (503)-

    945-7401. Please call this number and not individual's

    numbers to discuss daily burning.  For large burns (over

    2000 tons) or burns extending over a considerable period,

    please request a special forecast.  Avoid calling before

    8 a.m. and between 2 to 3 p.m.



    This forecast is available on the Internet at:

      http://oregon.gov/ODF/FIRE/fire.shtml/#Smoke_Management



    Please ensure your units have been planned and accomplished by checking:

      http://oregon.gov/ODF/FIRE/SMP/dailysmoke.shtml

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